Effect of sources and methods of zinc application on yeild and chemical composition of rice (Var.Ghasrodashty) in fars province, Iran
2005
Mirzavand, Jahan Bakhsh | Jookar, Ladan | Islami, Mahmood | Zare, Nader
Zinc is an essential plant nutrient for rice ( Oryza sativa L.). Zinc is the second element (after Nitrogen) which limits the growth of rice plant. Zinc deficiency in rice has been reported from all of the world. Soil properties such as high pH, low OM content, presence of high CO3Ca, submerging of soil and interaction of P with Zn has severe effect on Zn deficiency and appearance of its symptoms. In order to determine the effects of Zn sources, level and methods of application on yield and chemical composition of rice (CV Ghasrodashty), two fields experiment were conducted individually. The treatments were as follows: soil application of ZnSO4.7H2O at the rates of 0, 5, 10 and 15 kg zn/ha(first experiment) and insertion of seedling roots in suspension containing 0, 1 and 2 percent Zinc oxide for 30 minutes, before transplanting (second experiment). The experiments were designed as RCBD with 4 replications during 2 years. The results showed that application of ZnSO4.7H2O in the first year had significant effect (5%) on number of grain per spike, grain P content and Zn content of husk, but highly significant effect (1%) on grain protein content. in the second year application of different rates of zinc sulfate had a significant effect (5%) on N, K content of grain and number of grain per spike but highly significant effect (1%) on Mn contents of rice grain. The effect of Zn suspension of zinc oxide in the first year of experiment, had significant effect (5%) on zinc and protein content of grain but highly significant effect (1%) on N content of grain. In the second year the effect of zinc oxide on grain yield, N, K and protein content of grain was significant (5%). The ANOV of 2 years data showed that the effect of ZnSO4.7H2O on grain yield, number of grain per spike, N and P was significant (5%) but on protein content of grain highly significant (1%). The effect of zinc oxide on 1000 kernel (grain) weight and protein content were significant at 5 and 1% level respectively. The final conclusion is that, application of Zn in paddy fields of Fars province is essential, but with regard to the fertilizer source and amounts, it needs further study
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